Not every investments IMO. Safe deposits is also a form of investment and it is low risk especially if the bank is backed out by the government. It seems like you are assuming that every investment is indeed a HYIP by the tone that you judge that every investment are always high risk
I know safe deposit is one of a form invesment but the interest you got is so low and you need like high cash when do a deposit so you will earn like about 3-5%. If you just save it little by little I dont think that will good enough to earn some good cash.
It is actually up yo 7.5 % (mostly) per year depends on the your principal either, higher principal will get you more interest rate though. Even if the interest is low but it is still better than any type of other investment that are advertising high nonsense interest rates within short amount of time.
Actually safe deposits isnt a way to "earn" for living. People put their money on safe deposits because they got more than what they needed for living. In accordance to this thread, better to save or invest it, safe deposits would be the answer for it because it is on the middle of both investing and saving
the only problem with this is that your money are locked for the entire period, you can't get back your principal until the whole time has passed, what if you need them for a emergency? you are screwed, so they still hold a % of risk